Hi tigwig
It's all been said really. I've got 3 children. My daughter was 4 when my son was born and it was like he had 2 mums. She was an absolute darling with him, and having 2 of them seemed an absolute breeze. She'd come to me and tell me if he was a bit upset, or if she thought he needed changing etc. I think the age gap was lovely, as she was at an age when she understood if the baby took up my time at certain times, she would get my attention after. With you, your daughter, is going to be a bit older and I'll think you'll find it quite easy. My son was 3 when my 2nd son was born, and he was quite detached from me for the 1st few weeks after he was born. He seemed to hate the fact that this little baby had taken his place as the youngest. But he did come round and the 2 of them are best buds.
My youngest is now 4, a complete monster, destroys everything in his path, cheeky as hell and if he'd been my 1st he'd be an only child!!! But he looks at me with those big blue eyes and all is forgiven( well, almost LOL).
For all the arguments, lack of money, chaos etc. I'm so pleased that my kids will grow up knowing they'll always have their siblings there.